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Java > Open Source Codes > com > puppycrawl > tools > checkstyle > checks > j2ee > ThisReturnCheck


1 ////////////////////////////////////////////////////////////////////////////////
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// checkstyle: Checks Java source code for adherence to a set of rules.
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// Copyright (C) 2001-2005 Oliver Burn
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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////////////////////////////////////////////////////////////////////////////////
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package com.puppycrawl.tools.checkstyle.checks.j2ee;
20
21 import com.puppycrawl.tools.checkstyle.api.Check;
22 import com.puppycrawl.tools.checkstyle.api.DetailAST;
23 import com.puppycrawl.tools.checkstyle.api.TokenTypes;
24
25 /**
26  * Checks that 'this' is not returned by a bean method.
27  * Instead, you must use the result of the getEJBObject()
28  * available in SessionContext or EntityContext.
29  * http://www.javaworld.com/javaworld/jw-08-2000/jw-0825-ejbrestrict.html
30  * @author Rick Giles
31  */

32 public class ThisReturnCheck
33     extends Check
34 {
35     /**
36      * {@inheritDoc}
37      */

38     public int[] getDefaultTokens()
39     {
40         return new int[] {TokenTypes.LITERAL_THIS};
41     }
42
43     /**
44      * {@inheritDoc}
45      */

46     public int[] getRequiredTokens()
47     {
48         return getDefaultTokens();
49     }
50
51     /**
52      * {@inheritDoc}
53      */

54     public void visitToken(DetailAST aAST)
55     {
56         if (Utils.isInEJB(aAST)) {
57             DetailAST parent = aAST.getParent();
58
59             // skip parentheses
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while ((parent != null)
61                 && (parent.getType() == TokenTypes.LPAREN))
62             {
63                 parent = parent.getParent();
64             }
65
66             if ((parent != null)
67                 && (parent.getType() == TokenTypes.EXPR))
68             {
69                 parent = parent.getParent();
70                 if ((parent != null)
71                     && (parent.getType() == TokenTypes.LITERAL_RETURN))
72                 {
73                     log(
74                         aAST.getLineNo(),
75                         aAST.getColumnNo(),
76                         "thisreturn.bean");
77                 }
78             }
79         }
80     }
81 }
82
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